Gas-furnace



- K. G. LUNDIN.

GAS rumucs, APPLICATION FIL ED AUG. i1, 1920.-

mm A 30, 1921.

Frail I Ni EN TOR. KARL 6. Lama/1v KARL G. LUNDIN, DE LOS ANGELES, CALIFORNIA.

GAS-FURNACE.

Specification of Letters Patent.

Patented Aug. 30, 1921.

Application filed August 17, 1920. Serial No. 104,197.

. To all whom it may concern:

sand or similar material as shown at Be it known that I, KARL G. LUNDIN, a v citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Gas-Furnaces, of which the following is a specification.

It is the object of the present inventionto provide a furnace adapted to burn gaseous fuel and arranged to form an air heatingfurnace.

More specifically it is the object of the invention to provide a simplified sheet metal furnace construction in which,ser, ies of fiues for the products of combustion and forthe air are arranged with individual fiues of the respective series alternately positioned, the fiues for the products ofcombustion comprising down-draft fiues, and the fiues for %he air to be heated comprising up-draft ues.

? The invention will be readily understood from the following description of the accompanying drawings, in which- Figure 1 is afront elevation of the furnace.

Fig. 2 is a side elevation of the same partly broken away. i

Fig. 3 is a horizontal 3-3 of Fig. l. I

Fig. 4- is a vertical section on the line H of Fig. 3.

The furnace consists of an outer casing 1, preferably of sheet metal and arranged as a rectangular casing. This casing may be open at the bottom and closed at its upper end by the top 2 throu h which plpes 3 for the heated air extend. 11 opening 3' is provided in casing 1 at the bottom thereof for the intake of air. This opening is, prefersection on the line ably, covered by a screen 3. The top 2 is,

preferably, positioned belowthe level of the upper edges of the walls of casing 1, and 4: is, preferably, laid upon top 2.

A casing 5 is positionedwithin casing 1 in spaced relation from the side walls, top and bottom thereof. This casingis, preferably, of sheet metal and consists of a top 6 and a bottom 7 connected by sidewalls 8. The

. side walls each consist of spaced portions 9 forming a chamber 10' between said side walls and outwardly projecting flues 11 at the spaces between the portions 9 of the side walls, said fiues communicating with the chamber 10 at their inner ends. The casing 5 may be supportedin spaced relation above the bottomof the furnace by means of supports 12 shown as angle irons resting upon the supporting surface for the furnace and received within the angles formed by fiues 1'1 and portions 9 of the side walls.

A burner chamber 18 is positioned within the chamber 10 formedby casing 5, said burner chamber being supported in spaced relation above the bottom 7 of the chamber 5 and having an open upper end 14 terminating short of the top 6 of chamber 5. By this arrangement a' flue 15 is provided extending beneath the burner chamber and communicating with fiues 11 at the bottom of chamber 5. A discharge pipe 16 extends from one end of flue 15 through casing 5 and the outer casing 11. Above the burner cham ber 13 a space 17 is provided below the top 6 of chamber 5 which communicates with the fiues 11, said space being closed between said fiues by the portions 9 of the side walls of casing 5.

Burners 20 are arranged in the burner chamber 13, said burners being shown terminatingin pipes 21 extending outwardly through the front of casing 5 and outer casing 1. These pipes are provided with usual control valves 22 and communicate with a supply pipe 23. A pilot light 24 is also provided within the burner chamber, said pilot light being connected by a pipe 25 extending outwardly through casings 1 and 5 to the pipe 23. A door 26 is, preferably, provided in the front of easing 1, said door closing a frame 27 positioned between casing 1 and 5. An air intake to.-the burner chamber is arranged beneath the burners, said air intake being shown as a casing 28 positioned between casings 1 and 5 at suitable openings in the respective casings.

It will be understood that when the burners are in operation, air to support combustion will enter the burner chamber through the opening 28. The products of combuspassage 15, and from thence outwardly through the discharge pipe 16. At the same time air will'be drawn into casing 1 through opening 3 and will be discharged through pipes 3. This air will be in intimate contact with the heat radiating surface provided by easing "5, and a relatively large tion will be drawn out of the top of chamber '13 and downwardly through flues, 11 to the amount of air will be heated, due to the large radiating surface of casing 5 provided by the passages between flues 11.

Various changes may be made without departing from the spirit of the invention as claimed.

What is claimed is:

1. A furnace comprising a closed casing forming a radiator surface and including a central chamber and spaced flues at the sides thereof, a burner receptacle within said casing including a base and side walls, said base being in spaced relation from the bottom of said casing to form a passage beneaththe burner receptacle, said passage communicating with said flues, the side walls of said burner receptacle terminating short of the top of said casing so that the burner receptacle is open to said flues and to the passage beneath the burner receptacle, and a closed casing surrounding said radiator casing so as to form air passages around the radiator casing and between the flues of the same.

2. A furnace comprising a closed casing forming a radiator surface and including a central chamber and spaced flues at the sides thereof, a burner receptacle within said casing including a base and side walls, said base being in spaced relation from the bottom of said casing to form a passage beneath the burner receptacle, said passage communicating with said flues, the side walls of said burner receptacle terminating short of the topofsaid casing so that the burner receptacle is open to said flues and to the passage beneaththe burner receptacle; and a closed casing surrounding said radiator casing so as to form air passages around the radiator casing and between the flues of the same, the burner receptacle having an air intake thereto, and the passage beneath the burner receptacle having a discharge therefrom, the casing surrounding the radiator having top and bottom openings creating a draft through the air passages.

In testimony whereof I have signed my name to this specification.

. KARL G. LUNDIN. 

